PTA0/CMP0_IN2 input to comparator on KL03

carlostadeoorte — Wed, 15 Jul 2015 15:39:01 GMT

Hello dear Freescale community,

I am having trouble using PTA0 as CMP0_IN2 to the comparator to the input of the comparator.

As far as I see, my program works fine: if I use PTB5/COMP0_IN1, then everything runs fine, however I want to change from PTB5 to PTA0 since I don't want to mess with the NMI. if it is any useful, I am using the 16QFN package.

This is how my GPIO configuration looks:

//COMPARATOR PINS

//Pin PTA0 as comparator (cmp0_in2 -- ALT0)

//Pin PTB1 as comparator (cmp0_in3 -- default, ALT0 --- No need to configure, but just to be safe.

PORT_HAL_SetPullCmd(PORTB_BASE_PTR, 1u, false);

PORT_HAL_SetPullCmd(PORTA_BASE_PTR, 0u, false);

PORT_HAL_SetMuxMode(PORTB_BASE_PTR, 1u, kPortPinDisabled);

PORT_HAL_SetMuxMode(PORTA_BASE_PTR, 0u, kPortPinDisabled);

PORT_HAL_SetPullCmd(PORTA_BASE_PTR, 2u, false);

PORT_HAL_SetMuxMode(PORTA_BASE_PTR, 2u,kPortMuxAlt2);

For the comparator, I am using the driver. and this is how my configuration looks like:

cmp_comparator_config_t comp_config_struct = {

.hystersisMode = kCmpHystersisOfLevel3,

.pinoutEnable = true,

.pinoutUnfilteredEnable = true,

.invertEnable = false,

.highSpeedEnable = true,

.risingIntEnable = false,

.fallingIntEnable = false,

.triggerEnable = false,

//.minusChnMux = kCmpInputChn1, //CMP0_1 is located in PTB5

.minusChnMux = kCmpInputChn2, //CMP0_2 is located in PTA0

.plusChnMux = kCmpInputChn3, //CMP0_3 is located in PTB1

};

Then I just start the comparator like this:

assert( CMP_DRV_Init(BOARD_CMP_INSTANCE, &comp_state, &comp_config_struct) == kStatus_CMP_Success);

CMP_DRV_Start(BOARD_CMP_INSTANCE);

Debugging is of course a pain since PTA0 uses SWD_CLK, so as soon as I reach that point, I loose debugging capabilities.

Any advice would be really appreciated.

Thank you in advance!

-Carlos

Re: PTA0/CMP0_IN2 input to comparator on KL03

carlostadeoorte — Wed, 15 Jul 2015 19:43:06 GMT

Just as a a follow-up. The code above works perfectly fine, The error was somewhere else in the code where I'd set PTA0 as GPIO

Re: PTA0/CMP0_IN2 input to comparator on KL03

Hui_Ma — Thu, 16 Jul 2015 05:45:15 GMT

Hi,

Besides of above PTA0 pin MUX setting, it also need to change the <board.h> about BOARD_CMP_CHANNEL definition:

#define BOARD_CMP_CHANNEL

The KL03 PTA0 pin is CMP0_IN2.

Wish it helps.

Have a great day,
Ma Hui

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